ts_temp/function/when.js
import curryN from './curryN';
/**
* Tests the final argument by passing it to the given predicate function. If
* the predicate is satisfied, the function will return the result of calling
* the `onTrue` function with the same argument. If the predicate is not
* satisfied, the argument is returned as is.
*
* @param {Function} pred A predicate function
* @param {Function} onTrue A function to invoke when the `condition` evaluates to a truthy value.
* @param {*} x An object to test with the `pred` function and pass to `onTrue` if necessary.
* @return {*} Either `x` or the result of applying `x` to `onTrue`.
* @example
*
* // truncate :: String -> String
* var truncate = R.when(
* x => x.length > 10,
* x => x.slice(0, 10) + '...'
* );
* truncate('12345'); //=> '12345'
* truncate('0123456789ABC'); //=> '0123456789…'
*/
export default curryN(3, (pred, onTrue, x) => {
if (pred(x)) {
return onTrue(x);
}
return x;
});